[PATCH 14/22] /dev/random: kill unused md5 copy
From: Matt Mackall
Date: Thu Mar 25 2004 - 19:20:49 EST
/dev/random kill unused md5 copy
Remove long-dead md5 code
tiny-mpm/drivers/char/random.c | 160 +++--------------------------------------
1 files changed, 12 insertions(+), 148 deletions(-)
diff -puN drivers/char/random.c~kill-md5 drivers/char/random.c
--- tiny/drivers/char/random.c~kill-md5 2004-03-20 13:38:31.000000000 -0600
+++ tiny-mpm/drivers/char/random.c 2004-03-20 13:38:31.000000000 -0600
@@ -221,17 +221,13 @@
* number generator, which speed up the mixing function of the entropy
* pool, taken from PGPfone. Dale Worley has also contributed many
* useful ideas and suggestions to improve this driver.
- *
+ *
* Any flaws in the design are solely my responsibility, and should
* not be attributed to the Phil, Colin, or any of authors of PGP.
- *
+ *
* The code for SHA transform was taken from Peter Gutmann's
* implementation, which has been placed in the public domain.
- * The code for MD5 transform was taken from Colin Plumb's
- * implementation, which has been placed in the public domain.
- * The MD5 cryptographic checksum was devised by Ronald Rivest, and is
- * documented in RFC 1321, "The MD5 Message Digest Algorithm".
- *
+ *
* Further background information on this topic may be obtained from
* RFC 1750, "Randomness Recommendations for Security", by Donald
* Eastlake, Steve Crocker, and Jeff Schiller.
@@ -266,7 +262,6 @@
#define INPUT_POOL_SIZE 512
#define BLOCKING_POOL_SIZE 128
#define BATCH_ENTROPY_SIZE 256
-#define USE_SHA
/*
* The minimum number of bits of entropy before we wake up a read on
@@ -872,9 +867,9 @@ EXPORT_SYMBOL(add_disk_randomness);
/*
* This chunk of code defines a function
- * void HASH_TRANSFORM(__u32 digest[HASH_BUFFER_SIZE + HASH_EXTRA_SIZE],
+ * void sha_transform(__u32 digest[HASH_BUFFER_SIZE + HASH_EXTRA_SIZE],
* __u32 const data[16])
- *
+ *
* The function hashes the input data to produce a digest in the first
* HASH_BUFFER_SIZE words of the digest[] array, and uses HASH_EXTRA_SIZE
* more words for internal purposes. (This buffer is exported so the
@@ -882,24 +877,13 @@ EXPORT_SYMBOL(add_disk_randomness);
* and tacking it onto the end of the digest[] array is the quick and
* dirty way of doing it.)
*
- * It so happens that MD5 and SHA share most of the initial vector
- * used to initialize the digest[] array before the first call:
- * 1) 0x67452301
- * 2) 0xefcdab89
- * 3) 0x98badcfe
- * 4) 0x10325476
- * 5) 0xc3d2e1f0 (SHA only)
- *
* For /dev/random purposes, the length of the data being hashed is
* fixed in length, so appending a bit count in the usual way is not
* cryptographically necessary.
*/
-#ifdef USE_SHA
-
#define HASH_BUFFER_SIZE 5
#define HASH_EXTRA_SIZE 80
-#define HASH_TRANSFORM SHATransform
/* Various size/speed tradeoffs are available. Choose 0..3. */
#define SHA_CODE_SIZE 0
@@ -929,7 +913,7 @@ EXPORT_SYMBOL(add_disk_randomness);
( e += ROTL( 5, a ) + f( b, c, d ) + k + data, b = ROTL( 30, b ) )
-static void SHATransform(__u32 digest[85], __u32 const data[16])
+static void sha_transform(__u32 digest[85], __u32 const data[16])
{
__u32 A, B, C, D, E; /* Local vars */
__u32 TEMP;
@@ -1131,125 +1115,6 @@ static void SHATransform(__u32 digest[85
#undef K3
#undef K4
#undef subRound
-
-#else /* !USE_SHA - Use MD5 */
-
-#define HASH_BUFFER_SIZE 4
-#define HASH_EXTRA_SIZE 0
-#define HASH_TRANSFORM MD5Transform
-
-/*
- * MD5 transform algorithm, taken from code written by Colin Plumb,
- * and put into the public domain
- */
-
-/* The four core functions - F1 is optimized somewhat */
-
-/* #define F1(x, y, z) (x & y | ~x & z) */
-#define F1(x, y, z) (z ^ (x & (y ^ z)))
-#define F2(x, y, z) F1(z, x, y)
-#define F3(x, y, z) (x ^ y ^ z)
-#define F4(x, y, z) (y ^ (x | ~z))
-
-/* This is the central step in the MD5 algorithm. */
-#define MD5STEP(f, w, x, y, z, data, s) \
- ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
-
-/*
- * The core of the MD5 algorithm, this alters an existing MD5 hash to
- * reflect the addition of 16 longwords of new data. MD5Update blocks
- * the data and converts bytes into longwords for this routine.
- */
-static void MD5Transform(__u32 buf[HASH_BUFFER_SIZE], __u32 const in[16])
-{
- __u32 a, b, c, d;
-
- a = buf[0];
- b = buf[1];
- c = buf[2];
- d = buf[3];
-
- MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7);
- MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);
- MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);
- MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);
- MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7);
- MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);
- MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);
- MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);
- MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7);
- MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);
- MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);
- MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);
- MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7);
- MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);
- MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);
- MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);
-
- MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5);
- MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9);
- MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);
- MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);
- MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5);
- MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9);
- MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);
- MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);
- MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5);
- MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9);
- MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);
- MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);
- MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5);
- MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9);
- MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);
- MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);
-
- MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4);
- MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);
- MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);
- MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);
- MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4);
- MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);
- MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);
- MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);
- MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4);
- MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);
- MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);
- MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);
- MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4);
- MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);
- MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);
- MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);
-
- MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6);
- MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);
- MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);
- MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);
- MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6);
- MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);
- MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);
- MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);
- MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6);
- MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);
- MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);
- MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);
- MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6);
- MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);
- MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);
- MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);
-
- buf[0] += a;
- buf[1] += b;
- buf[2] += c;
- buf[3] += d;
-}
-
-#undef F1
-#undef F2
-#undef F3
-#undef F4
-#undef MD5STEP
-
-#endif /* !USE_SHA */
/*********************************************************************
*
@@ -1368,9 +1233,8 @@ static ssize_t extract_entropy(struct en
tmp[1] = 0xefcdab89;
tmp[2] = 0x98badcfe;
tmp[3] = 0x10325476;
-#ifdef USE_SHA
tmp[4] = 0xc3d2e1f0;
-#endif
+
/*
* As we hash the pool, we mix intermediate values of
* the hash back into the pool. This eliminates
@@ -1380,7 +1244,7 @@ static ssize_t extract_entropy(struct en
* function can be inverted.
*/
for (i = 0, x = 0; i < r->poolinfo->poolwords; i += 16, x+=2) {
- HASH_TRANSFORM(tmp, r->pool+i);
+ sha_transform(tmp, r->pool+i);
add_entropy_words(r, &tmp[x%HASH_BUFFER_SIZE], 1);
}
@@ -2277,7 +2141,7 @@ __u32 secure_tcp_syn_cookie(__u32 saddr,
tmp[0]=saddr;
tmp[1]=daddr;
tmp[2]=(sport << 16) + dport;
- HASH_TRANSFORM(tmp+16, tmp);
+ sha_transform(tmp+16, tmp);
seq = tmp[17] + sseq + (count << COOKIEBITS);
memcpy(tmp+3, syncookie_secret[1], sizeof(syncookie_secret[1]));
@@ -2285,7 +2149,7 @@ __u32 secure_tcp_syn_cookie(__u32 saddr,
tmp[1]=daddr;
tmp[2]=(sport << 16) + dport;
tmp[3] = count; /* minute counter */
- HASH_TRANSFORM(tmp+16, tmp);
+ sha_transform(tmp+16, tmp);
/* Add in the second hash and the data */
return seq + ((tmp[17] + data) & COOKIEMASK);
@@ -2314,7 +2178,7 @@ __u32 check_tcp_syn_cookie(__u32 cookie,
tmp[0]=saddr;
tmp[1]=daddr;
tmp[2]=(sport << 16) + dport;
- HASH_TRANSFORM(tmp+16, tmp);
+ sha_transform(tmp+16, tmp);
cookie -= tmp[17] + sseq;
/* Cookie is now reduced to (count * 2^24) ^ (hash % 2^24) */
@@ -2327,7 +2191,7 @@ __u32 check_tcp_syn_cookie(__u32 cookie,
tmp[1] = daddr;
tmp[2] = (sport << 16) + dport;
tmp[3] = count - diff; /* minute counter */
- HASH_TRANSFORM(tmp+16, tmp);
+ sha_transform(tmp+16, tmp);
return (cookie - tmp[17]) & COOKIEMASK; /* Leaving the data behind */
}
_
-
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